Electric light



y 1934- c. w. DAKE ELECTRIC LIGHT Filed April 25. 1951 2 Sheds-Sheet l INVENTOR U grZej Wfla%e B Q+GJL ATTORNEY-5.

May 8, 1934. C W, A E' 1,957,821

ELECTRIC LIGHT Filed April 25. 1951 2 Sheets-Sheet 2 INVENTOR Fatented may 8, 1934 i STATES PATENT This invention relates to an electric light bulb, to the support by cement or any suitable fastenparticularly to one which may be screwed into ing means B and to which the lead A is fastened position in a fixture and which becomes autoand with which it makes contact. At its lower matically locked therein so that it can not be end or edge the cap B is outwardly flared as at removed therefrom. B Above the flared portion and preferably ad- One object of the invention is to provide in conjacent its upper or outer end the cap Bis threaded nection with such a light a construction by means as at B Between the flared portion B and the of which the light, once having been locked in threaded portion B the cap is provided with one place, cannot be removed except upon breakage or more outwardly extending lugs B. These lugs 10 of internal parts. Another object is to provide may be formed by being punched outwardly from such a light which can be removed without breakthe body of the cap 13 and they are preferably aring the glass bulb but only after the breakage of ranged to provide straight edges B The upper internal parts, whereby the light is rendered unend of the cap 13 is open and is preferably proserviceable for further use, but the danger of invided with an inwardly extending flange B and 15 jury to an operator, either by broken glass or by one or more lugs B an electrical current,.is avoided. C is an exterior cap member. It is inwardly Other objects will appear from time to time in bent at its lower end or edge to provide a flange the specification and claims. C which engages the under surfaces of the lugs My invention is illustrated more or less dia- B of the member B to prevent the member B 20 grammatically in the accompanying drawings, and the bulb to which it is attached from falling wherein: out. The cap C is threaded as at C and is pro- Figure 1 is an elevation of the light; vided with an inwardly extending flange C Figure 2 is a cross sectional detail taken on an One or more lugs C are inwardly e f enlarged scale at line 22 of Figure 1, showing the barrel of the cap C. For some purposes inthe light before it has been screwed into position; stead of the lugs, indentations might be substi- Figure 3 is a cross sectional view, similar to Figtuted. These lugs or indentations co-operate ure 2, showing the light at one stage of the operwith the lugs B4 f he member B in a manner ation of removal, after certain of its internal which will be described below. Extending inparts have been broken; wardly from the member C is a portion C which 30 Figure 4 is a view similar to Figure 1, showing s preferably of such S and Shape as to be the light after the commencement of the removal; relatively easily b Figure 5 is an end view of the light; D is a plug p Closing ber formed of Figure 6 is a D1311 i of th d member of any suitable insulating member. It is preferthe light, seen from inside, looking in the direcably provided With & perforation D1 Whic eX- 5 t of t arrow in Figure 2; v tends through it and flares outwardly adjacent Figure '7 is an elevation with parts broken away its inner At its upper end the D fD ation and parts in section, showing the inner cap of D1 is reduced as at One 0 more notches D the base member; are formed in the sides of the member D. The

Figure 8 is a transverse sectional detail, taken Sides of the member are preferably wa d y 40 at line 3 s of Figure 3. and d w y clin d as shown in Figures Like parts are designated by like characters 2 and 3 a portion of their height d a e throughout t pe ifi ation and drawingsthen given a reverse inclination throughout an- A is a glass electric 11cm bulb. It is formed other portion of their height. A cav y or pocket at t upper end t an outwardly turned or D 15 formed in the inner or under surface of 45 tending ring A and an inwardly extending core the plug D and a Second Cavity pocket D5 is or tubular member A Within this member A formed, this Cavity being pla Over the v y is a glass sealing rod A This rod is joined to D4 and the tWO being joined y a p rforation D the sealing portion A of the bulb, and extends in- (D7 is a rivet fastening member p oned in wardly and outwardly from it. It may carry h perforation and engaging the b g =0 one or more arms A within the bulb which may member 0 to hold it in fixed relation with the support the filament A Suitable leads A and plug D. D is a contact member rovided with A are attached to the filament A and pass upa spring portion D This contact member is wardly and outwardly through the sealing porfastened in the reduced perforation D by a rivet tion A D to which the lead A is connected.

55 B is a threaded cap portion which is fastened It will be realized that whereas I have herewith shown and described a practical operative device, nevertheless many changes might be made in the size, shape, number and disposition of parts without departing from the spirit of my invention and I wish, therefore, that my showing be taken as in a sense diagrammatic.

The use and operation of my invention are as follows:

The parts are initially assembled as shown in Figures 1 and 2. In that position the plug D is held to the cap C by the breaking member C which is, of course, not yet broken. One or more of the lugs B extends into one or more of the depressions or cavities D The light will thus move as a unit and may be screwed into place in the usual manner in a socket or fitting provided for it. When this has been done and when the light is properly seated, an added turn is given. This turn breaks the member C and thereafter the bulb may be rotated but will not rotate the outer cap C because with the breaking link C broken, the inner cap B will turn in the outer cap C and the latter, therefore, cannot be unscrewed.

When the light is to be removed, the bulb is pressed upwardly toward the position shown in Figures 3 and 4 and until the threaded portion of the cap B engages the threaded portion of the cap G. Then further rotation of the bulb in the proper direction will cause the threads to co-operate to move the bulb upwardly or inwardly into the position shown in Figure 3. As this position is approached, the upper end of the glass member A contacts the plug member D. The perforation D through the latter is so positioned that the member A will inevitably contact the member D. Further inward movement of the bulb as a whole forces the member A against the member D and breaks it, sometimes breaking the entire interior glass structure so that the members A and A are broken and thus the light is rendered useless as the seal is destroyed. As the inner cap B moves into the position shown in Figure 3, the lugs B of that cap engage the lugs or depressions C of the cap C, as indicated in Figures 3 and 8, and then the two caps are locked together and the bulb as a whole may be rotated in the reverse direction and removed. It will be noticed that as the bulb is moved from the position shown in Figure 2 to that shown in Figure 3, the lugs B of the cap B are bent into the position shown in Figure 3 and that they move thus into the depressions D and in effect are locked in them and also the lugs B move to engage the lugs (3 and thus the cap B is locked to the cap C and also to the plug D.

The bulb is shown in Figure 1 in the position of use. In Figure 4 it is shown after it has been collapsed, that is to say, after it has been moved so that the inner glass member has been broken. As shown, the member A is broken off. Sometimes the breaking movement breaks the entire inner structure, sometimes merely a part of it, but always, before the parts have moved suificiently together to cause locking of the two caps so that removal may take place, some part of the interior glass structure has been broken.

I claim:

1. In combination in an electric light, a bulb comprising a movable envelope portion and an auxiliary portion integral with it, a cap secured to said bulb and surrounding said auxiliary portion, and an anvil portion within said cap against which said auxiliary portion may be moved for fracturing said auxiliary portion, while retaining said envelope portion intact.

2. In combination in an electric light, a bulb comprising a movable envelope portion and an auxiliary portion integral with and extending beyond it, a cap secured to said bulb and surrounding said auxiliary portion, and an anvil portion within said cap against which said auxiliary portion may be moved for fracturing said auxiliary portion, while retaining said envelope portion intact.

3. In combination in an electric light, a. bulb comprising an envelope portion and an auxiliary portion integral with it, a cap secured to said bulb and surrounding said auxiliary portion, and an anvil portion within said cap against which said auxiliary portion may be moved for fracturing said auxiliary portion, while retaining said envelope portion intact, saidanvil portionadapted to move with relation to said cap, said cap being positioned in part about said anvil portion.

4. In combination in an electric light, a bulb comprising an envelope portion and an auxiliary portion integral with and extending beyond it, a cap secured to said bulb and surrounding said auxiliary portion, and an anvil portion within said cap against which said auxiliary portion may be moved for fracturing said auxiliary portion, while retaining said envelope portion intact, said anvil portion adapted to move with relation to said cap, said cap being positioned in part about said anvil portion.

5. In combination in an electric light, a sealed glass bulb, said bulb comprising a main envelope portion and an additional portion, formed integral therewith, a cap fixed to said bulb, a second cap surrounding said first cap, and a breakable member adapted when unbroken to co-operate to hold the two against relative movement, whereby the light as a whole may be moved as a unit, the two caps free for relative movement when the breakable member is broken the two caps threadedly engaging each other, whereby rotation of the bulb will not accomplish removal of the light as a whole, and means operative in response to rotation of the bulb in one direction, for relocking the two caps together.

6. In combination in an electric light, a sealed glass bulb, said bulb comprising a main envelope portion and an additional portion, formed integral therewith, acap fixed to said bulb, a second cap surrounding said first cap and carrying an anvil portion, and a breakable member adapted when unbroken to co-operate to hold the two against relative movement, whereby the light as a whole may be moved as a unit, the two caps free for relative movement when the breakable member is broken, whereby rotation of the bulb will not accomplish removal of the light as a whole, and means operative in response to rotation of the bulb in one direction, for relocking the two caps together, the clearance within the first cap such that the two caps do not become locked together until the additional portion of the bulb has been fractured.

'7. In combination in an electric light bulb, comprising a main envelope portion and an additional portion, means for preventing the removal of the bulb from a socket, said means including a cap secured to said bulb, a second cap about said first cap, and adapted to engage a socket, there being a clearance within the caps and within the first cap such that when the two caps are moved together the additional'portion of the lass bulb is broken.

8. In combination in an electric light bulb, means for preventing the removal of the bulb from a socket, said means including a threaded cap secured to said bulb, a second cap about said first cap, and adapted to engage a socket, threaded portions on said caps adapted to be engaged and to be drawn together, there being a clearance within the caps and within the first cap such that as the two caps are moved together an interior portion of the glass bulb is broken.

9. In combination in an electric light bulb, means for preventing the removal of the bulb from a socket, said means including a cap secured to said bulb, a second cap about said first cap, and adapted to engage a socket, the caps being free for relative movement when the light is seated in the socket, there being a clearance within the caps and within the first cap such that when the two caps are moved together an interior portion of the glass bulb. is broken, and means effective after a predetermined movement of the first cap to lock the caps together.

10. In combination in an electric light bulb, a glass bulb having a projection extending beyond its boundaries, a cap fixed to said bulb and provided with engaging means, a second cap surrounding said first cap, the caps being free for relative movement when the bulb is in use, means on the caps, effective when they are given relative rotation, to draw them progressively together, there being a clearance within the caps and about said projection such that the latter will be broken before the two caps have reached the limit of their movement toward each other.

11. In combination in an electric light bulb, a glass bulb having an integral additional portion, a cap fixed to said bulb and provided with engaging means, a second cap surrounding said first cap, the caps being free for relative movement when the bulb is in use, means on the caps effective when they are given re'lative rotation to draw them progressively together, and means for locking them together after a predetermined amount of such rotational movementhas occurred, the clearance within the caps and about said integral additional portion such that the latter will be broken before the two caps have reached the limit of their movement toward each other.

12. In an electric light, a glass bulb formed with an internal portion, a cap fixed to said bulb, provided with a threaded end and with outwardly projecting lug members, a second cap positioned about said first cap, threaded and provided with inwardly extending lugs, the two caps being free for rotational and longitudinal movement when in use, the threads of the first cap adapted to be engaged with the threads of the second cap when the two are telescoped together, there being a clearance within the caps and between the parts such that upon a predetermined movement together of the two caps, the internal portion is fractured.

13. In an electric-light, a glass bulb formed with an internal portion, a cap fixed to said bulb, provided with outwardly projecting lug members, a second cap positioned about said first cap, and provided with inwardly extending lugs, the two caps being free for longitudinal movement when the light is in use, the lugs 01 the first cap adapted to be engaged with the lugs of the second cap when the two are telescoped together, the clearance between the parts being such that upon a predetermined movement together of the two caps, the internal portion is fractured, the lugs on the said caps adapted to lock them together when moved into opposition with each other.

14. In an electric light, a glass bulb, comprising a main envelope portion and having an auxiliary portion, a cap secured to said bulb and surrounding said auxiliary portion, a second cap surrounding said first cap, the two caps so shaped that they may be given initial relative movement in one direction and provided with engaging members which, after a predetermined relative rotation, cause engagement of the two caps to lock them together for unitary rotation in the reverse direction, there being a plug mounted in the second cap, there being a clearance within the caps and between the plug and the auxiliary portion of .the bulb such that when the caps are drawn together the auxiliary portion of the bulb is fractured.

15. In combination in an electric light bulb, comprising an envelope portion and an auxiliary portion integral with it, a cap secured to said bulb and surrounding said auxiliary portion, and a second cap mounted about the first cap, the two caps joined by a link which is broken when the light is put into use, the two caps being adapted, after the light has been put in use, to have relative longitudinal movement, and means for locking the caps together, said locking means acting to lock the caps together in response to relative telescoping movement of the caps, said telescoping movement being effective to fracture the auxiliary portion of the bulb.

16. In combination in an electric light bulb, comprising an envelope portion and an auxiliary portion integral with it, a cap secured to said bulb and surrounding said auxiliary portion, and a second cap mounted about the first cap, the two caps joined by a link which is broken when the light is put into use, the two caps being adapted, after the light has been put in use, to have relative movement, and means for locking the caps together, said locking means acting to lock the caps together in response to relative movement of the caps, said relative movement being efifective to fracture the auxiliary portion of the bulb.

CHARLES W. DAKE. 

